https://www.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/
This is more comprehensive actually: https://en.wikibooks.org/wiki/Bicycles/Maintenance_and_Repair/Gear-changing_Dimensions#Rear_Shift_Ratios
@lf started
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https://www.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/
This is more comprehensive actually: https://en.wikibooks.org/wiki/Bicycles/Maintenance_and_Repair/Gear-changing_Dimensions#Rear_Shift_Ratios